Hmmm....how "decently priced"?
At the bottom of the price ladder is the Charles Daly semi that Wal-Mart sells. I'm sure you could order them from a local shop if you wanted to. While they only come in synthetic stocks they are cheap and my friend here at school loves his. The trigger has alot of creep but is much lighter than my 870s or 500s. You will not go wrong with a "B" gun. Browning, Beretta, and Benelli. They will cost more...maybe look at used? Browning makes the "gold" and "silver" lines. Not sure what the difference is. Beretta makes the 3901 and AL391. You can get these a tad cheaper than Brownings. Benelli makes several but you're back at Browning prices and perhaps a bit more. Now there are a few "off-names" of Benellis. Franchi and Stoeger. These are alot of gun for the money and would be my recommendations. In Franchi, ask about the 720 or 48AL. The 48AL uses the same type of action the old A-5 used. (Long-recoil, not gas-operated. This is an older design and the only drawback is that you can't shoot 3" magnums and light target loads without having to adjust the system. This is a 1 minute task at most and in no more involved than simply unscrewing the cap and flipping a ring upside down.) Stoeger makes a model 2000 auto. It should get you going for less than $350. The Stoeger or a used auto would my recommendations. The biggest thing about finding a shotgun for her will be find one that fits!!! She'll hit more targets and most intelligent people don't enjoy a gun that they can't hit with.

You can look up the manufacturer's websites for all these guns. MSRP is not real world prices....good luck!